What information is available that can allow people to give quantitative measures of climate in earlier times? Give examples
What will be an ideal response?
There are many avenues of evidence. In historical times, we have human
descriptions in diaries and books. For earlier times, there is evidence from ice cores, from
pollen buried in lake sediments, from oxygen isotope ratios in the shells of diatoms on the
ocean floor, etc.
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Why do Jupiter, Saturn, Uranus, and Neptune all have rings?
a. They were left over from solar system formation. b. They all captured particles. c. All four planets had a large moon that disintegrated. d. All have small moons and orbiting particles that constantly collide and make rings.
A 15-?F air-filled capacitor is connected to a 50-V voltage source and becomes fully charged. The voltage source is then removed and a slab of dielectric that completely fills the space between the plates is inserted
The dielectric has a dielectric constant of 5.0. (a) What is the capacitance of the capacitor after the slab has been inserted? (b) What is the potential difference across the plates of the capacitor after the slab has been inserted? What will be an ideal response?
A pipe (E 5 110 GPa) carries a load P1 5 120 kN at A and a uniformly distributed load P2 5 100 kN on the cap plate at B. Initial pipe diameters and thicknesses are dAB 5 38 mm, tAB 5 12 mm, dBC 5 70 mm, and tBC 5 10 mm. Under loads P1 and P2, wall thickness tBC increases by 0.0036 mm. Poisson’s ratio ? for the pipe material is approximately:
(A) 0.27
(B) 0.30
(C) 0.31
(D) 0.34
A 5.0-liter gas tank holds 1.4 moles of helium (He) and 0.70 moles of oxygen (O2), at a temperature of 260 K
The atomic masses of helium and oxygen are 4.0 g/mol and 16.0 g/mol, respectively. Avogadro's number is 6.022 × 1023 molecules/mol and the Boltzmann constant is 1.38 × 10-23 J/K. The total random translational kinetic energy of the gas in the tank is closest to A) 6.8 kJ. B) 6.1 kJ. C) 7.6 kJ. D) 8.3 kJ. E) 9.1 kJ.